Note: When using a channel as a reference channel, remember that lower numbered channels are calculated ahead of higher numbered channels, e.g., CH1 is calculated ahead of CH2. This makes a difference when subtracting a reference channel in regard to the time aspect of the reference value.

If the channel is configured for Volts, the units automatically change to V; at this point, you have the option of selecting the millivolt unit (mV). The user can also change each channel to apply a linear equation (mX+b) to the data. When the mX+b option is selected the Configure Engineering Units dialog box is displayed. You are prompted to define “m” and “b” and the engineering units label; as well as which standard units the mX+b equation should be applied to. The engineering units chosen will be displayed in the “Units” column, and the “mX+b” equation will be applied to the reading from the device before the reading is displayed or written to disk.

The mX+b option is convenient for obtaining a value that has a linear relation to a channel reading.

X is the scanned voltage value read back from the acquisition device

m is [but not limited to] a proportionality constant or gain factor, but not zero.

bis the offset value (the value of the calculated reading when the scanned value is “zero”).

Alarm Configuration Columns

1)Low Limit  Set alarm low limit.

2)High Limit  Set alarm high limit.

3)Hysteresis  A hysteresis value can be set for each channel to avoid a “chatter” problem. See Appendix C, Set Point Hysteresis, page C-27.

4)Alarm #  You can assign one alarm number (1 to 32) to a channel. Any number of channels can be assigned to the same alarm number. A given digital output will be set “true” (1) if at least one of the common channels (assigned to a single alarm) enters an alarm state.

Acquisition Setup Dialog Box

The information entered in the Acquisition Setup dialog box is used by the Arm Acquisition command to set up the acquisition of data to disk. When the trigger is satisfied, the scans are collected at the selected scan frequency and stored to disk in the designated file.

The Acquisition Setup dialog box can be accessed in one of three ways: a) clicking on the Channel Configuration button (item 8 in Main Window figure), b) clicking on the Acquisition Setup tab from the Channels or Data Destination dialog boxes, c) using the Setup pull-down menu and selecting Acquisition.

ChartScan, NetScan, and MultiScan have two modes of data acquisition, these are:

Normal mode

High-speed, single-channel mode (burst mode)

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ChartView Software Reference

ChartScan User’s Manual

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Omega Vehicle Security 1400 manual Acquisition Setup Dialog Box, Alarm Configuration Columns

1400 specifications

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